The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS: python-pip 9.0.1-2.3~ubuntu1.18.04.8 python-pip-whl 9.0.1-2.3~ubuntu1.18.04.8 python3-pip 9.0.1-2.3~ubuntu1.18.04.8 Ubuntu 16.04 ESM: python-pip 8.1.1-2ubuntu0.6+esm5 python-pip-whl 8.1.1-2ubuntu0.6+esm5 python3-pip 8.1.1-2ubuntu0.6+esm5 Ubuntu 14.04 ESM: python-pip 1.5.4-1ubuntu4+esm4 python-pip-whl 1.5.4-1ubuntu4+esm4 python3-pip 1.5.4-1ubuntu4+esm4 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-5821-4
https://ubuntu.com/security/notices/USN-5821-1
https://launchpad.net/ubuntu/+source/python-pip/9.0.1-2.3~ubuntu1.18.04.8
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